Restrict Possible Usernames - Doubt using \g

JavaScript
#1

Tell us what’s happening:
when I use /g in my regular expression it returns True… but does not pass the case

2
21166×590 35.9 KB

When I didnt use it passes all the test case…

3
31097×623 35.2 KB

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Link to the challenge:

#2

If the regex has the global flag set, test() will advance the lastIndex of the regex. A subsequent use of test() will start the search at the substring of str specified by lastIndex ( exec() will also advance the lastIndex property). It is worth noting that the lastIndex will not reset when testing a different string.

#3